123766201849 has 4 divisors (see below), whose sum is σ = 124554521764. Its totient is φ = 122977881936.

The previous prime is 123766201841. The next prime is 123766201931. The reversal of 123766201849 is 948102667321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948102667321 = 1289 ⋅735533489.

It can be written as a sum of positive squares in 2 ways, for example, as 25822240249 + 97943961600 = 160693^2 + 312960^2 .

It is a cyclic number.

It is not a de Polignac number, because 123766201849 - 2³ = 123766201841 is a prime.

It is a super-2 number, since 2×123766201849² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123766201841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394159722 + ... + 394160035.

It is an arithmetic number, because the mean of its divisors is an integer number (31138630441).

Almost surely, 2^123766201849 is an apocalyptic number.

It is an amenable number.

123766201849 is a deficient number, since it is larger than the sum of its proper divisors (788319915).

123766201849 is an equidigital number, since it uses as much as digits as its factorization.

123766201849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788319914.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 123766201849 in words is "one hundred twenty-three billion, seven hundred sixty-six million, two hundred one thousand, eight hundred forty-nine".